illuminance

noun 0.761

radiance

noun 0.706

radiancy

noun 0.689

luminance

noun 0.656

photoirradiation

noun 0.646

luminosity

noun 0.645

luminous intensity

noun 0.643

radiation

noun 0.638

solar radiation

noun 0.631

insolation

noun 0.616

radiosity

noun 0.616

illumination

noun 0.615

luminous energy

noun 0.612

radiant

noun 0.611

sunlight

noun 0.610

illuminant

noun 0.603

reflectance

noun 0.598

electromagnetic radiation

noun 0.593

intensity

noun 0.589

radiate

noun 0.577

brightness

noun 0.570

emissivity

noun 0.568

infrared radiation

noun 0.568

luminescence

noun 0.562

radiation pressure

noun 0.558

effulgence

noun 0.556

thermal radiation

noun 0.556

incandescence

noun 0.555

intrinsic brightness

noun 0.555

electromagnetic energy

noun 0.554

illuminate

noun 0.553

transmittance

noun 0.542

ionizing radiation

noun 0.541

infrared

noun 0.540

ultraviolet radiation

noun 0.539

radio energy

noun 0.538

apparent brightness

noun 0.536

visible light

noun 0.535

radiometry

noun 0.533

solar energy

noun 0.533

light source

noun 0.531

electroluminescence

noun 0.531

sunray

noun 0.531

illumining

noun 0.529

glare

noun 0.528

ultraviolet light

noun 0.528

refulgence

noun 0.527

radiometer

noun 0.526

non-ionizing radiation

noun 0.526

reflectivity

noun 0.524

excitation energy

noun 0.523

iridescence

noun 0.523

luminosity function

noun 0.522

photon

noun 0.520

flux density

noun 0.516

white light

noun 0.516

light

noun 0.514

fluorescence

noun 0.511

shine

noun 0.510

emission

noun 0.508

lighting

noun 0.508

light industry

noun 0.507

ultraviolet

noun 0.507

light pollution

noun 0.504

photocurrent

noun 0.504

energy

noun 0.503

specific energy

noun 0.503

rightness

noun 0.503

photosensitivity

noun 0.503

inverse-square law

noun 0.503

absorbance

noun 0.502

gamma ray

noun 0.501

radioactivity

noun 0.501

transmissivity

noun 0.500

near infrared

noun 0.500